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Method for improving purification of aliphatic acids in petroleum geology sample

A technology for geological samples and fatty acids, applied in chemical instruments and methods, preparation of carboxylates, preparation of organic compounds, etc., can solve problems such as utilization of geochemical information affecting authenticity, discarding of transition phases, loss, etc., to improve accuracy effectiveness and authenticity, optimizing technical solutions, and avoiding loss rates

Inactive Publication Date: 2014-03-26
LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this method has serious problems in the actual operation process: it will cause a large amount of fatty acid loss; caused man-made changes, which will seriously affect the authenticity of its experimental results and the utilization of geochemical information
However, the traditional liquid-liquid extraction method only retains the aqueous phase for the subsequent acidification extraction step, while the transition phase that really contains a large amount of medium and long-chain fatty acids is discarded, causing huge losses
Therefore, the focus of fatty acid purification on the aqueous phase in traditional liquid-liquid extraction methods has serious drawbacks

Method used

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  • Method for improving purification of aliphatic acids in petroleum geology sample
  • Method for improving purification of aliphatic acids in petroleum geology sample
  • Method for improving purification of aliphatic acids in petroleum geology sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The improved method of purifying fatty acid in the petroleum geological sample of embodiment 1 comprises the following steps:

[0048] (1) Crushing the petroleum geological sample to 100-200 mesh to obtain geological sample powder.

[0049] (2) Add 20ml of organic solvent—chloroform to 10g of geological sample powder, and perform ultrasonic extraction at room temperature at a frequency of 20kHz for 20min, three times in total. After the extracts were combined, they were concentrated in a water bath at 70-80°C to obtain 10ml of total geological lipids.

[0050] (3) Add an alcohol-alkali solution of 1 times its volume to the total geological lipid, heat at 70°C, stir, condense and reflux for 4-5 hours to obtain 20ml of saponified solution.

[0051] (4) Add an equal volume of organic solvent—chloroform to the saponification solution, and carry out liquid-liquid extraction in a 125ml pear-shaped separating funnel, and each time there are aqueous phase, transition phase and...

Embodiment 2

[0055] The improved method of purifying fatty acid in the petroleum geological sample of embodiment 2 comprises the following steps:

[0056] (1) Crushing the petroleum geological sample to 100-200 mesh to obtain geological sample powder.

[0057] (2) Add 50ml of organic solvent—chloroform to 10g of geological sample powder, carry out Soxhlet extraction for 72 hours in a water bath at 70-80°C, and concentrate in a water bath at 70°C to obtain 10ml of total geological lipids.

[0058] (3) Add an alcohol-alkali solution twice its volume to the total geological lipid, heat at 80°C, stir, condense and reflux for 4-5 hours to obtain 30ml of saponified liquid.

[0059] (4) Add an equal volume of organic solvent—n-hexane in the saponification solution, and carry out liquid-liquid extraction in a pear-shaped separating funnel of 125ml. Aqueous phase, transition phase and organic phase appear in each system; extract until no longer until the transition phase occurs.

[0060] (5) Sepa...

Embodiment 3

[0063] The improved method of purifying fatty acid in the petroleum geological sample of embodiment 3 comprises the following steps:

[0064] (1) Crushing the petroleum geological sample to 100-200 mesh to obtain geological sample powder.

[0065] (2) Add 50ml of organic solvent—dichloromethane to 10g of geological sample powder, carry out Soxhlet extraction for 72 hours in a water bath at 40-50°C, and concentrate in a water bath at 40°C to obtain 10ml of total geological lipids things.

[0066] (3) Add an alcohol-alkali solution twice its volume to the total geological lipid, heat at 75°C, stir, condense and reflux for 4-5 hours to obtain 30ml of saponified liquid.

[0067] (4) Add an equal volume of organic solvent—methylene chloride in the saponification liquid, carry out liquid-liquid extraction in a pear-shaped separating funnel of 125ml, and water phase, transition phase and organic phase all appear in each system; until the transition phase occurs.

[0068] (5) Separ...

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Abstract

The invention relates to a method for improving the purification of aliphatic acids in a petroleum geology sample. The method comprises the following steps: 1, crushing the petroleum geology sample to obtain petroleum geology sample powder; 2, extracting the petroleum geology sample powder through an organic solvent, and concentrating to obtain total geological lipoids; 3, adding an alcohol-alkali solution to the total geological lipoids, heating, stirring, and condensation-refluxing to obtain a saponified solution; 4, adding the organic solvent to the saponified solution to carry out liquid-liquid extraction until no transition phases appear; 5, separating out water phases and the transition phases, and adding an acid to adjust the pH value of the obtained solution to 1-2 to obtain an aliphatic acid aliphatic acid component; 6, adding the organic solvent to the aliphatic acid component to extract, repeating the extraction two times, and separating out the obtained organic phase; and 7, concentrating the organic phase, and allowing the concentrated organic phase to stand to naturally and completely volatilize the organic solvent at room temperature to obtain the aliphatic acids in the sample. The method of the invention has the advantages of high purification efficiency, and effective reduction of the loss of the aliphatic acids, especially middle and long chain aliphatic acids.

Description

technical field [0001] The invention relates to the field of organic geochemistry, in particular to an improved method for purifying fatty acids in petroleum geological samples. Background technique [0002] As an important class of biomarker compounds, fatty acids have very important research value in the fields of organic geochemistry and environmental science. Through the study of fatty acid series composition in petroleum geological samples, information such as parent material source, maturity, biodegradation and climate change can be obtained. Especially since the 1980s, the discovery of immature oil and gas has attracted geologists' attention to the occurrence forms of fatty acids and the origin of oil and gas. Therefore, it is particularly important to obtain fatty acids from petroleum geological samples scientifically, effectively, quickly and comprehensively. [0003] At present, in the field of organic geochemistry, liquid-liquid extraction is the most commonly u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/487C07C51/48C07C53/126
Inventor 常江夏燕青马素萍雷天柱吴应琴杨燕
Owner LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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